Liquid crystal display device

ABSTRACT

The present invention provides a liquid crystal display device capable of preventing a decrease in voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) and resolving the problem of display defects such as white spots, alignment unevenness, image sticking, and the like. The liquid crystal display device of the present invention is characterized by preventing a decrease in voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) and suppressing the occurrence of display defects such as image sticking and the like, and is thus particularly useful for a VA-mode or PSVA-mode liquid crystal display device for active matrix driving, and can be applied to liquid crystal display devices such as a liquid crystal TV, a monitor, a cellular phone, a smart phone, and the like.

TECHNICAL FIELD

The present invention relates to a liquid crystal display device.

BACKGROUND ART

Liquid crystal display devices have been used for watches and electroniccalculators, various household electric appliances, measuringapparatuses, automotive panels, word processors, electronic notebooks,printers, computers, televisions, etc. Typical examples of a liquidcrystal display mode include a TN (twisted nematic) mode, a STN (supertwisted nematic) mode, a DS (dynamic light scattering) mode, a GH(guest-host) mode, an IPS (in-plane switching) mode, an OCB (opticallycompensated birefringence) mode, an ECB (electrically controlledbirefringence) mode, a VA (vertical alignment) mode, a CSH (colorsuper-homeotropic) mode, a FLC (ferroelectric liquid crystal), and thelike. Also, multiplex driving is popularized as a driving method insteadof usual static driving, and a simple matrix method and a recent activematrix (AM) method of driving by TFT (thin-film transistor), TFD(thin-film diode), or the like become the mainstream.

As shown in FIG. 1, a general color liquid crystal display deviceincludes two substrates (1) each having an alignment film (4), atransparent electrode layer (3 a) serving as a common electrode and acolor filter layer (2) which are disposed between one of the alignmentfilms and the substrate, and a pixel electrode layer (3 b) disposedbetween the other alignment film and the substrate, the substrates arearranged so that the alignment films thereof face each other, and aliquid crystal layer (5) is held between the substrates.

The color filter layer is composed of a black matrix and a color filterincluding a red color layer (R), a green color layer (G), a blue colorlayer (B), and, if required, a yellow color layer (Y).

Liquid crystal materials constituting liquid crystal layers haveundergone a high level of impurity control because impurities remainingin the materials significantly affect electric characteristics ofdisplay devices. In addition, with respect to materials constitutingalignment films, it has already been known that an alignment film is indirect contact with a liquid crystal layer, and impurities remaining inthe alignment film are moved to the liquid crystal layer and affect theelectric characteristics of the liquid crystal layer, and thuscharacteristics of a liquid crystal display device due to impurities inan alignment film material have been being investigated.

On the other hand, with respect to materials such as organic pigmentsand the like used in the color filter layers, like the alignment filmmaterials, it is supposed that, impurities contained affect the liquidcrystal layers. However, an alignment film and a transparent electrodeare interposed between the color filter layer and the liquid crystallayer, and thus it has been considered that the direct influence on theliquid crystal layer is greatly smaller than that of the alignment filmmaterial. However, the alignment film generally has a thickness of assmall as 0.1 μm or less, and the transparent electrode, for example,even a common electrode used on the color filter layer side and having athickness increased for enhancing conductivity, generally has athickness of 0.5 μm or less. Therefore, the color filter layer and theliquid crystal layer are not put in a completely isolated environment,and the color filter layer has the possibility of developing displaydefects such as white spots, alignment unevenness, image sticking, andthe like due to a decrease in voltage holding ratio (VHR) of the liquidcrystal layer and an increase in ion density (ID) which are caused byimpurities contained in the color filter layer through the alignmentfilm and the transparent electrode.

As a method for resolving the display defects due to impuritiescontained in pigments which constitute a color filter, there have beenstudied a method of controlling elusion of impurities into a liquidcrystal by using a pigment in which a ratio of an extract with ethylformate is decreased to a specified value or less (Patent Literature 1),and a method of controlling elusion of impurities into a liquid crystalby specifying a pigment in a blue color layer (Patent Literature 2).However, these methods are not much different from a method of simplydecreasing impurities in a pigment, and are thus unsatisfactory forimprovement for resolving the display defects even in the presentsituation in which a pigment purifying technique has recently beenadvanced.

On the other hand, with attention paid to a relation between organicimpurities contained in a color filter and a liquid crystal composition,there are disclosed a method of specifying a hydrophobic parameter ofliquid crystal molecules contained in a liquid crystal layer to be equalto or higher than a predetermined value, the hydrophobic parameterrepresenting insolubility of the organic impurities in the liquidcrystal layer, and a method of preparing a liquid crystal compositioncontaining a predetermined ratio or more of a liquid crystal compoundhaving —OCF₃ groups at the ends of liquid crystal molecules because the—OCF₃ groups at the ends of liquid crystal molecules have a correlationto the hydrophobic parameter (Patent Literature 3).

However, these cited documents each disclose an invention based on theprinciple that the influence of impurities in a pigment on a liquidcrystal layer is suppressed and disclose no research on a directrelation between a structure of a liquid crystal material and astructure of a colorant such as a dye/pigment or the like used in acolor filter, not leading to the resolution of the problem of displaydefects in advanced liquid, crystal display devices.

CITATION LIST Patent Literature

-   PTL 1: Japanese Unexamined Patent. Application Publication No.    2000-19321-   PTL 2: Japanese Unexamined Patent. Application Publication No.    2009-109542-   PTL 3: Japanese Unexamined Patent Application Publication Ho,    2000-192040

SUMMARY OF INVENTION Technical Problem

The present invention is aimed at providing a liquid crystal displaydevice including a specified liquid crystal composition and a colorfilter using a specified dye and/or pigment in order to prevent adecrease in voltage holding ratio (VHR) of a liquid crystal layer and anincrease in ion density (ID), thereby resolving the problems of displaydefects such as white spots, alignment unevenness, image sticking, andthe like.

Solution to Problem

In order to solve the above-described problems, the inventorsintensively studied combinations of colorants such as a dye/pigment andthe like which constitute a color filter and structures of liquidcrystal materials constituting a liquid crystal layer. As a result itwas found that a liquid crystal display device using aspecified-structure liquid crystal composition and a color filtercontaining a specified-structure dye and/or pigment prevents a decreasein voltage holding ratio (VHR) of a liquid crystal layer and an increasein ion density (ID), thereby resolving the problems of display defectssuch as white spots, alignment, unevenness, image sticking, and thelike. This led to the achievement of the present invention.

That is, the present invention provides a liquid crystal display deviceincluding a first substrate, a second substrate, a liquid crystalcomposition layer held between the first substrate and the secondsubstrate, a color filter including a black matrix and at least RGBthree-color pixel portions, a pixel electrode, and a common electrode,the liquid crystal composition layer including a liquid crystalcomposition which contains at least, one compound selected from acompound group represented by general formula (LC1) to general formula(LC4),

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 15 carbon atoms, at least one CH₂ group in the alkyl groupmay be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF₂O—,or —OCF₂— so that oxygen atoms are not directly adjacent to each other,at least one hydrogen atom in the alkyl group may be arbitrarilysubstituted by a halogen, A₁ and A₂ each independently represent any oneof the following structures,

(at least one CH₂ group in a cyclohexane ring in the structures may besubstituted by an oxygen atom, at least one CH group in a benzene ringin the structures may be substituted by a nitrogen atom, and at leastone hydrogen atom in the structures may be substituted by Cl, CF₃, orOCF₃), Z₁ to Z₄ each independently represent a single bond, —CH═CH—,—C≡C—, —CH₂CH₂—, —(CH₂)₄—, —COO—, —OCH₂—, —CH₂O—, —OCF₂—, or —CF₂O—, Z₅represents a CH₂ group or an oxygen atom, at least one of Z₁ and Z₂present, is not a single bond, l₁ represents 0 or 1, m₁ and m₂ eachindependently represent 0 to 3, and m₁+m₂ is 1, 2, or 3), and the RGBthree-color pixel portions including, as colorants, adiketopyrrolopyrrole pigment and/or anionic red organic dye in a R pixelportion, at least one selected from the group consisting of ahalogenated copper phthalocyanine pigment, a phthalocyanine green dye,and a mixture of a phthalocyanine blue dye and an azo yellow organic dyein a G pixel portion, and a ∈-type copper phthalocyanine pigment and/orcationic blue organic dye in a B pixel portion.

Advantageous Effects of Invention

A liquid crystal display device according to the present invention iscapable of preventing a decrease in voltage holding ratio (VHR) of aliquid crystal layer and an increase in ion density (ID) by using aspecified liquid crystal composition and a color filter including aspecified dye and/or pigment, thereby preventing the occurrence ofdisplay defects such as white spots, alignment unevenness, imagesticking, and the like.

DESCRIPTION OF EMBODIMENTS

FIG. 2 shows an example of a liquid crystal display device according tothe present invention. Two substrates (1) including a first, substrateand a second substrate each have an alignment film (4), a transparentelectrode layer (3 a) serving as a common electrode and a color filterlayer (2 a) containing a specified dye and/or pigment are disposedbetween one of the alignment films (4) and the substrate, a pixelelectrode layer (3 b) is disposed between the other alignment film andthe substrate, the substrates are arranged so that the alignment filmsface each other, and a liquid crystal layer (5 a) containing a specifiedliquid crystal composition is held between the substrates.

The two substrates in the display device are bonded together with asealing material disposed in a peripheral region, and in many cases, agranular spacer or a resin spacer columns formed by a photolithographymethod is disposed between the substrates in order to maintain a gapbetween the substrates.

(Liquid Crystal Layer)

The liquid crystal layer in the liquid crystal display device of thepresent invention preferably includes a liquid crystal composition whichcontains at least one compound selected from a compound grouprepresented by general formula (LC1) to general formula (LC4),

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 15 carbon atoms, at least one CH₂ group in the alkyl groupmay be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF₂O—,or —OCF₂— so that oxygen atoms are not directly adjacent to each other,at least one hydrogen atom in the alkyl group may be arbitrarilysubstituted by a halogen, A₁ and A₂ each independently represent any oneof the following structures,

(at least one CH₂ group in a cyclohexane ring in the structures may besubstituted by an oxygen atom, at least, one CH group in a benzene ringin the structures may be substituted by a nitrogen atom, and at leastone hydrogen atom in the structures may be substituted by Cl, CF₃, orOCF₃), Z₁ to Z₄ each independently represent a single bond, —CH═CH—,—C≡C—, —CH₂CH₂—, —(CH₂)₄—, —COO—, —OCH₂—, —CH₂O—, —OCF₂—, or —CF₂O—, Z₅represents a CH₂ group or an oxygen atom, at least one of Z₁ and Z₂present is not a single bond, l₁ represents 0 or 1, m₁ and m₂ eachindependently represent 0 to 3, and m₁+m₂ is 1, 2, or 3).

Preferably, R₁ and R₂ each independently represent an alkyl group having1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or analkenyl group having 2 to 7 carbon atoms.

Preferably, A₁ and A₂ each independently represent any one of thefollowing structures,

Preferably, Z₁ to Z₄ each independently represent a single bond,—CH₂CH₂—, —COO—, —OCH₂—, —CH₂O—, —OCF₂—, or —CF₂O—.

The liquid crystal composition preferably further contains at least onecompound represented by general formula (LC5),

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 15 carbon atoms, at least one CH₂ group in the alkyl groupmay be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF₂O—,or —OCF₂— so that oxygen atoms are not directly adjacent to each other,at least one hydrogen atom in the alkyl group may be arbitrarilysubstituted by a halogen, B₁ to B₃ each independently represent any oneof the following,

(in the formulae, at least one CH₂CH₂ group in a cyclohexane ring may besubstituted by —CH═CH—, —CF₂O—, or —OCF₂—, and at least one CH group ina benzene ring may be substituted by a nitrogen atom), Z₃ and Z₄ eachindependently represent a single bond, —CH═CH—, —C≡C—, —CH₂CH₂—,—(CH₂)₄—, —COO—, —OCH₂—, —CH₂O—, —OCF₂—, or —CF₂O—, at least one of Z₁and Z₂ is not a single bond, and m₁ represents 0 to 3).

Preferably, R₁ and R₂ each independently represent an alkyl group having1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or analkenyl group having 2 to 7 carbon atoms.

Preferably, B₁ to B₃ each independently represent any one of thefollowing structures.

Preferably, Z₃ and Z₄ each independently represent a single bond,—CH₂CH₂—, —COO—, —OCH₂—, —CH₂O—, —OCF₂—, or —CF₂O—.

The general formula (LC1) more preferably represents at least onecompound selected from the group consisting of compounds represented bygeneral formula (LC1)-1 to general formula (LC1)-7 below,

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms,an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy grouphaving 2 to 7 carbon atoms).

The general formula (LC2) more preferably represents at least onecompound selected from the group consisting of compounds represented bygeneral formula (LC2)-1 to general formula (LC2)-15 below,

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms,an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy grouphaving 2 to 7 carbon atoms, and Z¹ represents —CH₂CH₂—, —OCH₂—, —CH₂O—,—OCF₂—, or —CF₂O—, and A₁ represents any one of the followingstructures).

The general formula (LC3) more preferably represents at least onecompound selected from the group consisting of compounds represented bygeneral formula (LC3)-1 to general formula (LC3)-6 below, and thegeneral formula (LC4) more preferably represents at least one compoundselected from the group consisting of compounds represented by generalformula (LC4)-1 to general formula (LC4)-4 below,

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms,an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy grouphaving 2 to 7 carbon atoms).

The general formula (LC5) more preferably represents at least onecompound selected from the group consisting of compounds represented bygeneral formula (LC5)-1 to general formula (LC5)-13 below,

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms,an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy grouphaving 2 to 7 carbon atoms).

The liquid crystal composition layer may contain at least onepolymerizable compound. The polymerizable compound is preferably adisk-shaped liquid crystal compound having a structure in which abenzene derivative, a triphenylene derivative, a truxene derivative, aphthalocyanine derivative, or a cyclohexane derivative serves as acentral mother nucleus of a molecule and is radially substituted bylinear alkyl groups, linear alkoxy groups, or substituted benzoyloxygroups as side chains.

Specifically, the polymerizable compound is preferably a polymerizablecompound represented by general formula (PC1),

(in the formula, P₁ represents a polymerizable functional group, Sp₁represents a spacer group having 0 to 20 carbon atoms, Q₁ represents asingle bond, —O—, —NH—, —NHCOO—, —OCONH—, —CH═CH—, —CO—, —COO—, —OCO—,—OCOO—, —OOCO—, —CH═CH—, —CH═CH—COO—, —OCO—CH═CH—, or —C≡C—, n₁ and n₂each represent 1, 2, or 3, MG represents a mesogenic group or amesogenity supporting group, R₃ represents a halogen atom, a cyanogroup, or an alkyl group having 1 to 25 carbon atoms, at least one CH₂group in the alkyl group may be substituted by —O—, —S—, —NH—, —N(CH₃)—,—CO—, —COO—, —OCO—, —OCOO—, —SCO—, —COS—, or —C≡C— so that oxygen atomsare not directly adjacent to each other, and alternatively R₃ representsP₂-Sp₂-Q₂- (wherein P₂, Sp₂, and Q₂ independently represent the samemeanings as P₁, Sp₁, and Q₁, respectively).

In the general formula (PC1), MG is more preferably represented by thefollowing structure,

(in the formula, C₁ to C₃ each independently represent a 1,4-phenylenegroup, a 1,4-cyclohexylene group, a 1,4-cyclohexenyl group, atetrahydropyran-2,5-diyl group, a 1,3-dioxane-2,5-diyl group, atetrahydrothiopyran-2,5-diyl group, a 1,4-bicyclo(2,2,2)octylene group,a decahydronaphthalene-2,6-diyl group, a pyridine-2,5-diyl group, apyrimidine-2,5-diyl group, a pyrazine-2,5-diyl group, a1,2,3,4-tetrahydronaphthalene-2,6-diyl group, a 2,6-naphthylene group, aphenanthrene-2,7-diyl group, a 9,10-dihydrophenanthrene-2,7-diyl group,a 1,2,3,4,4a,9,10a-octahydrophenanthrene-2,7-diyl group, or afluorene-2,7-diyl group, the 1,4-phenylene group,1,2,3,4-tetrahydronaphthalene-2,6-diyl group, 2,6-naphthylene group,phenanthrene-2,7-diyl group, 9,10-dihydrophenanthrene-2,7-diyl group,1,2,3,4,4a,9,10a-octahydrophenanthrene-2,7-diyl group, andfluorene-2,7-diyl group may have as a substituent at least one F, Cl,CF₃, OCF₃, cyano group, alkyl group having 1 to 8 carbon atoms, alkoxygroup, alkanoyl group, alkanoyloxy group, alkenyl group having 2 to 8carbon atoms, alkenyloxy group, alkenoyl group, or alkenyloxy group, Y₁and Y₂ each independently represent —COO—, —OCO—, —CH₂CH₂—, —OCH₂—,—CH₂O—, —CH═CH—, —C≡C—, —CH═CHCOO—, —OCOCH═CH—, —CH₂CH₂COO—,—CH₂CH₂OCO—, —COOCH₂CH₂—, —OCOCH₂CH₂—, —CONH—, —NHCO—, or a single bond,and n₅ represents 0, 1, or 2), Sp₁ and Sp₁ each independently representan alkylene group, the alkylene group may be substituted by at least onehalogen atom or cyano group, at least one CH₂ group in the alkylenegroup may be substituted by —O—, —S—, —NH—, —N(CH₃)—, —CO—, —COO—,—OCO—, —OCOO—, —SCO—, —COS—, or —C≡C— so that oxygen atoms are notdirectly adjacent to each other, and P₁ and P₂ each independentlyrepresent a structure selected from the group consisting of compoundsrepresented by general formula (PC1-a) to general formula (PC1-d) below,

(in the formulae, R₄₁ to R₄₃, R₅₁ to R₅₃, and R₆₁ to R₆₃ eachindependently represent a hydrogen atom, a halogen atom, or an alkylgroup having 1 to 5 carbon atoms).

More specifically, the general formula (PC1) is preferably apolymerizable compound represented by general formula (PC1)-1 or generalformula (PC1)-2,

(P₁, Sp₁, Q₁, P₂, Sp₂, Q₂ and MG represent the same meanings as in thegeneral formula (PC1), and n₃ and n₄ each independently represent 1, 2,or 3).

More specifically, the general formula (PC1) is preferably at least onepolymerizable compound selected from the group consisting of compoundsrepresented by general formula (PC1)-3 to general formula (PC1)-11,

(in the formulae, P₁, P₂, Sp₁, Sp₂, Q₁, and Q₂ represent the samemeanings as in the general formula (PC1), W₁ each independentlyrepresent F, CF₃, OCF₃, CH₃, OCH₃, an alkyl group having 2 to 5 carbonatoms, an alkoxy group, an alkenyl group, COOW₂, OCOW₂, or OCOOW₂(wherein W₂ each independently represent a linear or branched alkylgroup having 1 to 10 carbon atoms or an alkenyl group having 2 to 5carbon atoms), n₃ each independently represent 1, 2, or 3, n₄ eachindependently represent 1, 2, or 3, n₆ each independently represent 0,1, 2, 3, or 4, and n₃+n₆ on the same ring and n₄+n_(∈) on the same ringare 5 or less).

In the general formula (PC1) and the general formula (PC1)-1 to generalformula (PC1)-11, Sp₁, Sp₂, Q₁, and Q₂ are preferably singe bonds. n₃+n₄is preferably 1 to 3 and preferably 1 or 2. P₁ and P₂ are preferablyformula (PC1-c). W₁ is preferably F, CF₃, OCF₃, CH₃, or OCH₃. n₆ is 1,2, 3, or 4.

Specifically, the following compounds are preferred.

Further, a hydrogen atom in a benzene ring of (PC1-3a) to (PC1-3i) maybe substituted by a fluorine atom.

Also, MG in the general formula (PC1) is preferably a disk-shaped liquidcrystal compound represented by general formula (PC1)-9,

(in the formula, R₇ each independently represent a substituentrepresented by P₁-Sp₁-Q₁ or general formula (PC1-e) (wherein P₁, Sp₁,and Q₁ represent the same meanings as in the general formula (PC1), R₈₁and R₈₂ each independently represent a hydrogen atom, a halogen atom, ora methyl group, R₈₃ represents an alkoxy group having 1 to 20 carbonatoms, and at least one hydrogen atom in the alkoxy group is substitutedby a substituent represented by the general formula (PC1-a) to (PC1-d)).

The amount of the polymerizable compound used is preferably 0.05 to 2.0%by mass.

The liquid crystal composition can be singly used for theabove-described applications, and can further contain at least oneantioxidant and at least one UV absorbent.

(Color Filter)

A color filter according to the present invention includes a blackmatrix and at least RGB three-color pixel portions, the RGB three-colorpixel portions including, as colorants, a diketopyrrolopyrrole pigmentand/or anionic red organic dye in a R pixel portion, at least oneselected from the group consisting of a halogenated copperphthalocyanine pigment, a phthalocyanine green dye, and a mixture of aphthalocyanine blue dye and an azo yellow organic dye in a G pixelportion, and a ∈-type copper phthalocyanine pigment and/or cationic blueorganic dye in a B pixel portion.

The RGB three-color pixel portions preferably include, as colorants, C.I. Solvent Red 124 in the R pixel portion, a mixture of C. I. SolventBlue 67 and C. I. Solvent Yellow 162 in the G pixel portion, and C. I.Solvent Blue 7 in the B pixel portion.

Also, the RGB three-color pixel portions preferably include, ascolorants, C. I. Pigment Red 254 in the R pixel portion, C. I. PigmentGreen 7 and/or 36 in the G pixel portion, and C. I. Pigment Blue 15:6 inthe B pixel portion.

The RGB three-color pixel portions preferably further include, as acolorant in the R pixel portion, at least one organic dye/pigmentselected from the group consisting of C. I. Pigment Red 177, 242, 166,167, and 179, C. I. Pigment Orange 38 and 71, C. I. Pigment Yellow 150,215, 185, 138, and 139, C. I. Solvent Red 89, C. I. Solvent Orange 56,and C. I. Solvent Yellow 21, 82, 83:1, 33, and 162.

The RGB three-color pixel portions preferably include, as a colorant inthe G pixel portion, at least one organic dye/pigment selected from thegroup consisting of C. I. Pigment Yellow 150, 215, 185, and 138, and C.I. Solvent Yellow 21, 82, 83:1, and 33.

The RGB three-color pixel portions preferably further include, as acolorant in the B pixel portion, at least one organic dye/pigmentselected from the group consisting of C. I. Pigment Blue 1, C. I.Pigment Violet 23, C. I. Basic Blue 7, C. I. Basic Violet 10, C. I. AcidBlue 1, 90, and 83, and C. I. Direct Blue 86.

Also, the color filter includes a black matrix, RGB three-color pixelportions, and a Y pixel portion, and preferably contains, as a colorantin the Y pixel portion, at least one yellow organic dye/pigment selectedfrom the group consisting of C. I. Pigment Yellow 150, 215, 135, 138,and 139, and C. I. Solvent Yellow 21, 82, 83:1, 33, and 162.

In the color filter, the color filter pixel portions can be formed by agenerally known method. A typical method for forming pixel portions is aphotolithography method in which a photocurable composition describedbelow is applied to a surface of a color filter transparent substrate onthe side provided with a black matrix and then dried by heating(prebaked), the photocurable compound is cured in portions correspondingto the pixel portions by pattern exposure under irradiation withultraviolet light through a photomask, unexposed portions are developedwith a developer, and then non-pixel portions are removed to fix thepixel portions to the transparent substrate. This method forms the pixelportions each composed of a cured color film of the photocurablecomposition on the transparent substrate.

A photocurable composition described below is prepared for each of Rpixels, G pixels, B pixels, and if required, other color pixels such asY pixels or the like, and the above-described operation is repeated toproduce a color filter having color pixel portions of the R pixels, Gpixels, B pixels, and Y pixels at predetermined positions.

Examples of a method for applying each photocurable compositiondescribed below to the transparent substrate of glass or the likeinclude a spin coating method, a roll coating method, an ink jet method,and the like.

The drying conditions of a coating film of the photocurable compositionapplied to the transparent substrate are generally 50° C. to 150° C. andabout 1 to 15 minutes, depending on the type and mixing ratio of eachcomponent, or the like. Light used for photocuring the photocurablecomposition is preferably ultraviolet light within a wavelength range of200 to 500 nm or visible light. Various light sources which emit lightwithin this wavelength range can be used.

Examples of a development method include a puddle method, a dippingmethod, a spray method, and the like. After exposure and development ofthe photocurable composition, the transparent substrate on whichnecessary color pixel portions have been formed is washed with water anddried. The resultant color filter is heat-treated (post, baked) at 90°C. to 280° C. for a predetermined time using a heating apparatus such asa hot plate, an oven, or the like to remove volatile components in thecolor coating film and, at the same time, to heat-cure an unreactedphotocurable compound remaining in the cured color coating film of thephotocurable composition, completing the color filter.

By using the colorants for the color filter of the present invention incombination with the liquid crystal composition of the presentinvention, it is possible to provide a liquid crystal display devicecapable of preventing a decrease in voltage holding ratio (VHR) of theliquid crystal layer and an increase in ion density (ID) and resolvingthe problems of display defects such as white spots, alignmentunevenness, image sticking, and the like.

A method for producing the photocurable composition is generally amethod in which a dye and/or pigment composition for the color filter ofthe present, invention, an organic solvent, and a dispersant are used asessential components, these components are mixed and uniformly dispersedby stirring to prepare a pigment dispersion for forming a pixel portionof the color filter, and a photocurable compound and, if required, athermoplastic resin, a photopolymerization initiator, and the like areadded to the dispersion to produce the photocurable composition.

Examples of the organic solvent, used include aromatic solvents such astoluene, xylene, methoxybenzene, and the like; acetic acid estersolvents such as ethyl acetate, propyl acetate, butyl acetate, propyleneglycol monomethyl ether acetate, propylene glycol monoethyl etheracetate, diethylene glycol methyl ether acetate, diethylene glycol ethylether acetate, diethylene glycol propyl ether acetate, diethylene glycolbutyl ether acetate, and the like; propionate solvents such asethoxyethyl propionate, and the like; alcohol solvents such as methanol,ethanol, and the like; ether solvents such as butyl cellosolve,propylene glycol monomethyl ether, diethylene glycol ethyl ether,diethylene glycol dimethyl ether, and the like; ketone solvents such asmethyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and thelike; aliphatic hydrocarbon solvents such as hexane and the like;nitrogen compound solvents such as N,N-dimethylformamide,γ-butyrolactam, N-methyl-2-pyrrolidone, aniline, pyridine, and the like;lactone solvents such as γ-butyrolactone and the like; and carbamic acidesters such as a mixture of methyl carbamate and ethyl carbamate at48:52, and the like.

Examples of the dispersant which can be used include dispersants such asBYK Chemie DISPERBYK 130, DISPERBYK 161, DISPERBYK 162, DISPERBYK 163,DISPERBYK 170, DISPERBYK 171, DISPERBYK 174, DISPERBYK 180, DISPERBYK182, DISPERBYK 183, DISPERBYK 184, DISPERBYK 185, DISPERBYK 2000,DISPERBYK 2001, DISPERBYK 2020, DISPERBYK 2050, DISPERBYK 2070,DISPERBYK 2096, DISPERBYK 2150, DISPERBYK LPN21116, and DISPERBYKLPN6919; Efka Chemicals Company Efka 46, Efka 47, Efka 452, Efka LP4008,Efka 4009, Efka LP4010, Efka LP4050 and LP4055, Efka 400, Efka 401, Efka402, Efka 403, Efka 450, Efka 451, Efka 453, Efka 4540, Efka 4550, EfkaLP4560, Efka 120, Efka 150, Efka 1501, Efka 1502, and Efka 1503;Lubrizol Corporation Solsperse 3000, Solsperse 9000, Solsperse 13240,Solsperse 13650, Solsperse 13940, Solsperse 17000 and 18000, Solsperse20000, Solsperse 21000, Solsperse 20000, Solsperse 24000, Solsperse26000, Solsperse 27000, Solsperse 28000, Solsperse 32000, Solsperse36000, Solsperse 37000, Solsperse 38000, Solsperse 41000, Solsperse42000, Solsperse 43000, Solsperse 46000, Solsperse 54000, and Solsperse71000; and Ajimonoto Co., Ltd. Ajisper PB711, Ajisper PB821, AjisperPB822, Ajisper PB814, Ajisper PN411, and Ajisper PA111; and syntheticresins which are liquid at room temperature and water-insoluble, such asacryl resins, urethane resins, alkyd resins, natural rosins such as woodrosin, gum rosin, tall oil rosin, and the like, modified rosins such aspolymerized rosin, disproportionate rosin, hydrogenated rosin, oxidizedrosin, maleinized rosin, and the like, rosin derivatives such as rosinamine, lime rosin, rosin alkyleneoxide adduct, rosin alkyd adduct,rosin-modified phenol, and the like. Addition of any one of thedispersants and resins contributes to a decrease in flocculation andimprovements in dispersion stability of pigments and viscositycharacteristics of the dispersant.

Examples of a dispersion aid which can be used include organic pigmentderivatives such as phthalimide methyl derivatives, sulfonic acidderivatives, N-(dialkylamino)methyl derivative,N-(dialkylaminoalkyl)sulfonic amide derivatives, and the like. Ofcourse, these derivatives can be used in combination of two or moredifferent types.

Examples of the thermoplastic resin used for preparing the photocurablecomposition include urethane resins, acryl resins, polyamide resins,polyimide resins, styrene-maleic acid resins, styrene-maleic anhydrideresins, and the like.

Examples of the photocurable compound include difunctional monomers suchas 1,6-hexanediol diacrylate, ethylene glycol diacrylate, neopentylglycol diacrylate, triethylene glycol diacrylate,bis(acryloxyethoxy)bisphenol A, 3-methylpentanediol diacrylate, and thelike; polyfunctional monomers with relatively low molecular weight, suchas trimethylolpropane triacrylate, pentaerythritol triacrylate,tris[2-(meth)acryloyloxyethyl) isocyanurate, dipentaerythritolhexaacrylate, dipentaerythritol pentaacrylate, and the like; andpolyfunctional monomers with relatively high molecular weight, such aspolyester acrylate, polyurethane acrylate, polyether acrylate, and thelike.

Examples of the photopolymerization initiator include acetophenone,benzophenone, benzyl dimethyl ketal, benzoyl peroxide,2-chlorothioxanthone, 1,3-bis(4′-azidobenzal)-2-propane,1,3-bis(4′-azidobenzal)-2-propane-2′-sulfonic acid,4,4′-diazidostilbene-2,2′-disulfonic acid, and the like. Examples of acommercially available photopolymerization initiator include BASFCorporation “Irgacure (trade name)-184”, “Irgacure (trade name)-369”,“Darocur (trade name)-1173”, and BASF Corporation “Lucirin-TPO”, NipponKayaku Co., Ltd. “Kayacure (trade name) DETX” and “Kayacure (trade name)OA”, Sutoufa Chemical Co., “Baikyua 10” and “Baikyua 55”, Akzo Co., Ltd.“Trigonal PI”, Sandozu Co., Ltd. “Sandorei 1000”, Apujon Co., Ltd.“Deep”, Kurogane Kasei Co., Ltd. “Biimidazole”, and the like.

The photopolymerization initiator can be combined with a knownphotosensitizer in common use. Examples of the photosensitizer includeamines, ureas, sulfur atom-containing compounds, phosphorusatom-containing compounds, chlorine atom-containing compounds, nitrites,other nitrogen atom-containing compounds, and the like. These can beused alone or in combination of two or more.

The ratio of the photopolymerization initiator mixed is not particularlylimited but is preferably in a range of 0.1% to 30% on a mass basisrelative to a compound having a photopolymerizable or photocurablefunctional group. With the ratio less than 0.1%, sensitivity duringcuring tends to be decreased, while with the ratio exceeding 30%,crystals of the photopolymerization initiator may be precipitated when acoating film of a pigment-dispersed resist is dried, thereby causingdeterioration in the physical properties of the coating film.

By using each of the above-described materials, on a mass basis, 300 to1000 parts of the organic solvent and 1 to 100 parts of the dispersantrelative to 100 parts of the color filter dye and/or pigment compositionof the present invention are uniformly dispersed by stirring to preparethe dye/pigment solution. Then, to the pigment dispersion, thethermoplastic resin and the photocurable compound in a total of 3 to 20parts per part of the pigment composition for the color filter of thepresent invention, 0.05 to 3 parts of the photopolymerization initiatorper part of the photocurable compound, and if required, the organicsolvent are added and uniformly dispersed by stirring to produce thephotocurable composition for forming each of the color filter pixelportions.

A known organic solvent or aqueous alkali solution in common use can beused as the developer. In particular, when the photocurable compositioncontains the thermoplastic resin or the photocurable compound at leastone of which has an acid value and exhibits alkali solubility, washingwith an aqueous alkali solution is effective for forming the colorfilter pixel portions.

Although the method for producing the color filter pixel portions by thephotolithography method is described in detail, each of the color filterpixel portions prepared by using the color filter pigment composition ofthe present invention may be formed by another method such as anelectrodeposition method, a transfer method, a micelle electrolysismethod, a PVED (Photovoltaic Electrodeposition) method, an ink jetmethod, a reverse printing method, a heat curing method, or the like,thereby producing the color filter.

(Alignment Film)

In the liquid crystal display device of the present invention, when thealignment film for aligning the liquid crystal composition is requiredto be provided on the surface of each of the first and second substrateswhich is in contact with the liquid crystal composition, the alignmentfilm is disposed between the color filter and the liquid crystal layer.However, even in the case of a thick film, the alignment, film has athickness of as small as 100 nm or less so as not to completely cut offthe interaction between the colorants such as pigments or the like,which constitute the color filter, and the liquid crystal compoundconstituting the liquid crystal layer.

The liquid crystal display device without using the alignment film hasgreater interaction between the colorants such as pigments or the like,which constitute the color filter, and the liquid crystal compoundconstituting the liquid crystal layer.

Usable examples of an alignment film material include transparentorganic materials such as polyimide, polyamide, BCB (benzocyclobutenepolymer), polyvinyl alcohol, and the like. In particular, it ispreferred to use a polyimide alignment film produced by imidizing apolyamic-acid synthesized from diamine such as an aliphatic or alicyclicdiamine, for example, p-phenylenediamine, 4,4′-diaminodiphenylmethane,or the like, and an aliphatic or alicyclic tetracarboxylic anhydride,such as butanetetracarboxylic anhydride,2,3,5-tricarboxycyclopentylacetic anhydride, or the like, or an aromatictetracarboxylic anhydride such as pyromellitic dianhydride or the like.In this case, rubbing is generally used as an alignment, impartingmethod, but when the alignment film is used as a vertical alignmentfilm, it can be used without imparting alignment.

A material containing a compound containing chalcone, cinnamate,cinnamoyl, or an azo group can be used as the alignment film material,and this may be used in combination with a material such as polyimide,polyamide, or the like. For this alignment, film, rubbing may be used ora light alignment technique may be used.

The alignment film is generally formed as a resin film by applying thealignment film material to the substrate using a method such as a spincoating method or the like, but a uniaxial stretching method, aLangmuir-Blodgett method, or the like can also be used.

(Transparent Electrode)

In the liquid crystal display device of the present invention, aconductive metal oxide can be used as a material of the transparentelectrode. Usable examples of the metal oxide include indium oxide(In₂O₃), tin oxide (SnO₂), zinc oxide (ZnO), indium-tin oxide(In₂O₃—SnO₂), indium-zinc oxide (In₂O₃—ZnO), niobium-added titaniumdioxide (Ti_(1-x)Nb_(x)O₂), fluorine-doped tin oxide, graphenenanoribbons or metal nanowires, and the like. But zinc oxide (ZnO),indium-tin oxide (In₂O₃—SnO₂), or indium-zinc oxide (In₂O₃—ZnO) ispreferred. The transparent conductive film can be patterned by a methodsuch as a photo-etching method, a method using a mask, or the like.

The liquid crystal layer of the present invention is useful for a liquidcrystal display device, particularly a liquid crystal display device foractive matrix driving, and can be used for a liquid crystal displaydevice for a VA mode, an IPS mode, or an ECB mode.

The liquid crystal layer containing the polymerizable monomer accordingto the present invention, for example, the liquid crystal layer used fora PSA mode and a PSVA mode, is imparted with the liquid crystalalignment ability when the polymerizable monomer contained ispolymerized by ultraviolet irradiation, and is used for a liquid crystaldisplay device in which a quantity of transmitted light is controlled byusing birefringence of the liquid crystal composition. The liquidcrystal layer is useful for AM-LCD (active matrix liquid crystal displaydevice), TN (nematic liquid crystal display device), STN-LCD(super-twisted nematic liquid crystal display device), OCB-LCD andIPS-LCD (in-plane switching liquid crystal display device), particularlyuseful for AM-LCD, and can be used for a transmissive or reflectiveliquid crystal display device.

The liquid crystal display device of the present invention is used incombination with a backlight for various applications such as a liquidcrystal television, a monitor of a personal computer, a cellular phone,a display of a smart phone, a notebook-size personal computer, aportable information terminal, a digital signage, and the like. Examplesof the backlight include a cold-cathode tube-type backlight, atwo-wavelength-peak pseudo-white backlight and three-wavelength-peakbacklight each using a light-emitting diode using an inorganic materialor an organic EL element, and the like.

EXAMPLES

A best mode of the present invention is partially described in detailbelow by way of examples, but the present invention is not limited tothese examples. In the examples and comparative examples below, “%” in acomposition represents “% by mass”.

The physical properties of a liquid crystal composition are representedas follows.

T_(N-I): nematic-isotropic liquid phase transition temperature (° C.) asliquid crystal phase upper limit temperature

Δ∈: dielectric constant anisotropy

Δn: refractive index anisotropy

η: viscosity at 20° C. (mPa·s)

d_(gap): gap between first substrate and second substrate of cell (μm)

VHR: voltage holding ratio at 70° C. (%)

(a value by % representing a ratio of a measured voltage to an initialapplied voltage, the measured voltage being measured using a liquidcrystal composition injected into a cell having a cell thickness of 3.5μm under the conditions of 5 V applied, a frame time of 200 ms, and apulse width of 64 μs)

ID: ion density at 70° C. (pC/cm²)

(a value of ion density measured using a liquid crystal compositioninjected into a cell having a cell thickness of 3.5 μm and MTR-1(manufactured by Toyo Corporation) under the conditions of 20 V appliedand a frequency of 0.05 Hz)

Compounds are represented by abbreviations below.

n (Number) at end C_(n)H_(2n+1)—

-2- —CH₂CH₂—

-10- —CH₂O—

-01- —OCH₂—

-0n —OC_(n)H_(2N+1)

-1=1- —HC═CH—

-V0- —COO—

ndm- C₂H_(2N)—HC═CH—(CH₂)_(n=1)—

Image sticking of the liquid crystal display device was evaluated bydisplay of a predetermined fixed pattern within a display area for 1000hours and then uniform display over the entire screen to visuallyobserve the level of residual image of the fixed pattern based on thefollowing 4 levels:

A: No residual image

B: Slight residual image at an allowable level

C: Residual image at an unallowable level

D: Significant residual image

[Formation of Color Filter]

[Preparation of Colored Composition]

[Red Dye Colored Composition 1]

In a polymer bottle, 10 parts of red dye 1 (C. I. Solvent Red 124) wasplaced, and 55 parts of propylene glycol monomethyl ether acetate andSEPR beads of 0.3 to 0.4 mm in diameter were added, and the resultantmixture was dispersed with a paint, conditioner (manufactured by ToyoSeiki Co., Ltd.) for 4 hours and then filtered with a 5 μm filter toproduce a dye colored solution. Then, 75.00 parts of the dye coloredsolution, 5.50 parts of polyester acrylate resin (Arorix (trade name)M7100 manufactured by Toa Gosei Chemical Industry Co., Ltd.), 5.00 partsof dipentaerythritol hexaacrylate (KAYARAD (trade name) DPHA,manufactured by Nippon Kayaku Co., Ltd.), 1.00 part of benzophenone(KAYACURE (trade name) BP-100, manufactured by Nippon Kayaku Co., Ltd.),and 13.5 parts of Ucar Ester EEP were stirred with a dispersion stirrerand then filtered with a filter having a pore size of 1.0 μm to producered dye colored composition 1.

[Red Dye Colored Composition 2]

Red dye colored composition 2 was produced by the same method asdescribed above using 8 parts of the red dye 1 (C. I. Solvent Red 124)and 2 parts of yellow dye 2 (C. I. Solvent Yellow 21) in place of 10parts of the red dye 1 of the red dye colored composition 1.

[Red Dye Colored Composition 3]

Red dye colored composition 3 was produced by the same method asdescribed above using 10 parts of red dye 2 (C. I. Solvent Red 1) inplace of 10 parts of the red dye 1 of the red dye colored composition 1.

[Green Dye Colored, Composition 1]

Green dye colored composition 1 was produced by the same method asdescribed above using 3 parts of blue dye 1 (C. I. Solvent Blue 67) and7 parts of yellow dye 1 (C. I. Solvent Yellow 162) in place of 10 partsof the red dye 1 of the red dye colored composition 1.

[Green Dye Colored Composition 2]

Green dye colored composition 2 was produced by the same method asdescribed above using 4 parts of the yellow dye 1 (C. I. Solvent Yellow162) and 3 parts of yellow dye 3 (C. I. Solvent Yellow 82) in place of 7parts of the yellow dye 1 of the green dye colored composition 1.

[Green Dye Colored Composition 3]

Green dye colored composition 3 was produced by the same method asdescribed above using 10 parts of green dye 1 (C. I. Solvent Green 7) inplace of 3 parts of the blue dye 1 and 7 parts of the yellow dye 1 ofthe green dye colored composition 1.

[Blue Dye Colored Composition 1]

Blue dye colored composition 1 was produced by the same method asdescribed above using 10 parts of the blue dye 1 (C. I. Solvent Blue 7)in place of 10 parts of the red dye 1 of the red dye colored composition1.

[Blue Dye Colored Composition 2]

Blue dye colored composition 2 was produced by the same method asdescribed above using 7 parts of the blue dye 1 (C. I. Solvent Blue 7)and 3 parts of violet, dye 1 (C. I. Basic Violet 10) in place of 10parts of the blue dye 1 of the blue dye colored composition 1.

[Blue Dye Colored Composition 3]

Blue dye colored composition 3 was produced by the same method asdescribed above using 10 parts of blue dye 2 (C. I. Solvent Blue 12) inplace of 7 parts of the blue dye 1 and 3 parts of the violet dye 1 ofthe blue dye colored composition 2.

[Yellow Dye Colored Composition 1]

Yellow dye colored composition 1 was produced by the same method asdescribed above using 10 parts of yellow dye 2 (C. I. Solvent Yellow 21)in place of 10 parts of the red dye 1 of the red dye colored composition1.

[Yellow Dye Colored Composition 2]

Yellow dye colored composition 2 was produced by the same method asdescribed above using 10 parts of yellow dye 4 (C. I. Solvent Yellow 2)in place of 10 parts of the yellow dye 2 of the yellow dye coloredcomposition 1.

[Red Pigment Colored Composition 1]

In a polymer bottle, 10 parts of red pigment 1 (C. I. Pigment Red 254,“IRGAPHOR RED BT-CF” manufactured by BASF Corporation) was placed, and55 parts of propylene glycol monomethyl ether acetate, 7.0 parts ofDISPERBYK LPN21116 (manufactured by BYK Chemie Corporation), and SEPRbeads of 0.3 to 0.4 mm in diameter were added, and the resultant mixturewas dispersed with a paint conditioner (manufactured by Toyo Seiki Co.,Ltd.) for 4 hours and then filtered with a 5 μm filter to produce apigment-dispersed solution. Then, 75.00 parts of the pigment-dispersedsolution, 5.50 parts by polyester acrylate resin (Aronix (trade name)M7100 manufactured by Toa Gosei Chemical Industry Co., Ltd.), 5.00 partsof dipentaerythritol hexaacrylate (KAYAPAD (trade name) DPHA,manufactured by Nippon Kayaku Co., Ltd.), 1.00 part, of benzophenone(KAYACURE (trade name) BP-100, manufactured by Nippon Kayaku Co., Ltd.),and 13.5 parts of Ucar Ester EEP were stirred with a dispersion stirrerand then filtered with a filter having a pore size of 1.0 μm to producered pigment colored composition 1.

[Red Pigment Colored Composition 2]

Red pigment colored composition 2 was produced by the same method asdescribed above using 6 parts of the red pigment 1, 2 parts of redpigment 2 (C. I. Pigment Red 177 manufactured by DIC Corporation,FASTOGEN SUPER RED ATY-TR), and 2 parts of yellow pigment 2 (C. I.Pigment Yellow 139) in place of 10 parts of the red pigment 1 of the redpigment colored composition 1.

[Green Pigment Colored Composition 1]

Green pigment colored composition 1 was produced by the same method asdescribed above using 6 parts of green pigment 1 (C. I. Pigment Green36, manufactured by DIG Corporation, “FASTOGEN GREEN 2YK-CF”), and 4parts of yellow pigment 1 (C. I. Pigment Yellow 150, manufactured byBAYER Corporation, FANCHON FAST YELLOW E4GN) in place of 10 parts of thered pigment 1 of the red pigment colored composition 1.

[Green Pigment Colored Composition 2]

Green pigment colored composition 2 was produced by the same method asdescribed above using 4 parts of green pigment 2 (C. I. Pigment Green 7,manufactured by DIC Corporation, FASTOGEN GREEN S) and 6 parts of yellowpigment 3 (C. I. Pigment Yellow 138) in place of 6 parts of the greenpigment 1 and 4 parts of the yellow pigment 1 of the green pigmentcolored composition 1.

[Blue Pigment Colored Composition 1]

Blue pigment colored composition 1 was produced by the same method asdescribed above using 9 parts of blue pigment 1 (C. I. Pigment Blue15:6, manufactured by DIC Corporation, “FASTOGEN BLUE EP-210”) and 1part of violet pigment 1 (C. I. Pigment Violet 23) in place of 10 partsof the red pigment 1 of the red pigment colored composition 1.

[Blue Pigment-Dye Colored Composition 2]

Blue pigment-dye colored composition 2 was produced by the same methodas described above using 1 part of violet dye 1 (C. I. Basic Violet 10)in place of 1 part of the violet pigment 1 of the blue pigment coloredcomposition 1.

[Yellow Pigment Colored Composition 1]

Yellow pigment colored composition 1 was produced by the same method asdescribed above using 10 parts of yellow pigment 1 (C. I. Pigment Yellow15, manufactured by BAYER Corporation, FANCHON FAST YELLOW E4GN) inplace of 10 parts of the red pigment 1 of the red pigment coloredcomposition 1.

[Formation of Color Filter]

The red colored composition was applied to a thickness of 2 μm by spincoating on a glass substrate on which a black matrix had been previouslyformed. After drying at 70° C. for 20 minutes, stripe-shaped patternexposure was performed with ultraviolet light through a photomask usingan exposure apparatus provided with a super-high pressure mercury lamp.Then, spray development with an alkali developer for 90 seconds, washingwith ion exchange water, and air drying were performed. Further, postbaking was performed in a clean oven at 230° C. for 30 minutes to formred pixels as a stripe-shaped color layer on the transparent substrate.

Next, similarly, the green colored composition was applied to athickness of 2 μm by spin coating. After drying, a stripe-shaped colorlayer was formed in a position deviated from the red pixels by exposurewith an exposure apparatus and development, thereby forming green pixelsadjacent to the red pixels.

Next, similarly, the blue colored composition was applied to a thicknessof 2 μm by spin coating, forming blue pixels adjacent to the red pixelsand the green pixels. As a result, a color filter having stripe-shapedpixels of the three colors of red, green, and blue was produced.

If required, similarly, the yellow colored composition was applied to athickness of 2 μm by spin coating, forming yellow pixels adjacent to thered pixels, the green pixels and the blue pixels. As a result, a colorfilter having stripe-shaped pixels of the four colors of red, green,blue, and yellow was produced.

Color filters 1 to 4 and comparative color filter 1 were formed by usingthe dye colored compositions or pigment colored compositions shown inTable 1.

TABLE 1 Comparative Color filter 1 Color filter 2 Color filter 3 Colorfilter 4 Color filter 1 R pixel Red dye Red dye Red pigment Red pigmentRed dye portion colored colored colored colored colored composition 1composition 2 composition 1 composition 2 composition 3 G pixel Greendye Green dye Green pigment Green pigment Green dye portion coloredcolored colored colored colored composition 1 composition 2 composition1 composition 2 composition 3 B pixel Blue dye Blue dye Blue pigmentBlue pigment- Blue dye portion colored colored colored dye coloredcolored composition 1 composition 2 composition 1 composition 2composition 3 Y pixel No Yellow dye No Yellow pigment Yellow dye portioncolored colored colored composition 1 composition 1 composition 2

Examples 1 to 4

An electrode structure was formed on each of first and secondsubstrates, and a vertical alignment-type alignment film was formed oneach of the facing surfaces of the substrates and weakly rubbed to forma VA cell. Then, liquid crystal composition 1 having negative dielectricanisotropy and shown in Table 2 was held between the first, substrateand the second substrate. Next, liquid crystal display devices ofExamples 1-4 were formed by using the color filters 1 to 4 shown inTable 1 (d_(gap)=3.5 μm, alignment film SE-5300). VHR and ID of theresultant liquid crystal display devices were measured. Also, imagesticking of the resultant liquid crystal display devices was evaluated.The results are shown in Table 3.

TABLE 2 Liquid crystal composition 0d1-Cy-Cy-3 20 3-Cy-Cy-2 153-Cy-Ph-O1 5 0d1-Cy-1O-Ph5-O1-Cy-2 11 0d1-Cy-1O-Ph5-O1-Cy-3 110d1-Cy-1O-Ph5-O1-Cy-4 11 0d1-Cy-1O-Ph5-O1-Cy-5 11 0d1-Cy-Cy-1O-Ph5-O3d04 0d1-Cy-Cy-1O-Ph5-O4d0 4 0d1-Cy-1O-Ph5-O1-Cy-Cy-2 40d1-Cy-1O-Ph5-O1-Cy-Cy-3 4 Composition ratio total (%) 100 Tni/° C. 82.4Δn(20° C.) 0.074 η20/mPa · s 16.1 Δε(20° C.) −4.7

TABLE 3 Example 1 Example 2 Example 3 Example 4 Liquid crystal LiquidLiquid Liquid crystal Liquid crystal composition crystal crystalcomposition 1 composition 1 com- com- position 1 position 1 Color filterColor Color Color filter 3 Color filter 4 filter 1 filter 2 VHR 99.199.0 99.5 99.4 ID 64 76 17 22 Image sticking B B A A

The liquid crystal display devices of Examples 1 to 4 could realize highVHR and small ID. Also, in evaluation of image sticking, no residualimage or slight residual image at an allowable level was observed.

Comparative Examples 1 to 8

Each of comparative liquid crystal composition 1 and comparative liquidcrystal composition 2 shown in Table 4 and having negative dielectricanisotropy was interposed in the VA cell used in Example 1, liquidcrystal display devices of Comparative Examples 1 to 8 were formed byusing the color filters 1 to 4 shown in Table 1, and VHR and ID of theresultant liquid crystal display devices were measured. Also, imagesticking of the resultant, liquid crystal display devices was evaluated.The results are shown in Table 5 and Table 6.

TABLE 4 Comparative Comparative liquid crystal liquid crystalcomposition 1 composition 2 0d1-Cy-Cy-3 20 20 3-Cy-Cy-2 15 14 3-Cy-Ph-O15 5 0d1-Cy-1O-Ph15-O1-Cy-2 8 8 0d1-Cy-1O-Ph15-O1-Cy-3 8 80d1-Cy-1O-Ph15-O1-Cy-4 10 10 0d1-Cy-1O-Ph15-O1-Cy-5 10 100d1-Cy-Cy-1O-Ph15-O3d0 4 4 0d1-Cy-Cy-1O-Ph15-O4d0 4 40d1-Cy-1O-Ph15-O1-Cy-Cy-2 4 4 0d1-Cy-1O-Ph15-O1-Cy-Cy-3 4 43-Cy-Oc-Ph15-O1 8 3-Cy-Cb1-Ph15-O2 3 5-Cy-Cb1-Ph15-O2 3 5-Cy-Cb-Ph15-O22 Composition ratio total 100 100 Tni/° C. 81.9 81.3 Δn(20° C.) 0.0730.074 η20/mPa · s 17.3 16.8 Δε(20° C.) −4.6 −4.7

TABLE 5 Comparative Comparative Comparative Comparative Example 1Example 2 Example 3 Example 4 Liquid crystal Comparative ComparativeComparative Comparative composition liquid liquid liquid liquid crystalcrystal crystal crystal com- com- com- com- position 1 position 1position 1 position 1 Color filter Color filter 1 Color filter 2 Colorfilter 3 Color filter 4 VHR 98.4 98.2 98.6 98.4 ID 125 141 118 120 Imagesticking D D C D

TABLE 6 Comparative Comparative Comparative Comparative Example 5Example 6 Example 7 Example 8 Liquid crystal Comparative ComparativeComparative Comparative composition liquid liquid liquid liquid crystalcrystal crystal crystal com- com- com- com- position 2 position 2position 2 position 2 Color filter Color filter 1 Color filter 2 Colorfilter 3 Color filter 4 VHR 98.3 98.1 98.6 98.5 ID 124 150 121 122 Imagesticking D D D D

The liquid crystal display devices of Comparative Examples 1 to 8 showedlower VHR and larger ID than the liquid crystal display devices of thepresent invention. Also, in evaluation of image sticking, the occurrenceof residual image at an unallowable level was observed.

Comparative Example 9

The liquid crystal composition 1 shown in Table 2 and having negativedielectric anisotropy was interposed in the VA cell used in Example 1,and a liquid crystal display device of Comparative Example 9 was formedby using the comparative color filter 1 shown in Table 1, and VHR and IDof the resultant liquid crystal display device were measured. Also,image sticking of the resultant liquid crystal display device wasevaluated. The results are shown in Table 7.

TABLE 7 Comparative Example 9 Liquid crystal composition Liquid crystalcomposition 1 Color filter Comparative color filter 1 VHR 97.7 ID 208Image sticking D

The liquid crystal display device of Comparative Example 9 showed lowerVHR and larger ID than the liquid crystal display devices of the presentinvention. Also, in evaluation of image sticking, the occurrence ofresidual image at an unallowable level was observed.

Comparative Examples 10 to 13

As in Example 1, comparative liquid crystal composition 3 shown in Table8 and having negative dielectric anisotropy was interposed, and liquidcrystal display devices of Comparative Examples 10 to 13 were formed byusing the color filters 1 to 4 shown in Table 1, and VHR and ID of theresultant liquid crystal display devices were measured. Also, imagesticking of the resultant liquid crystal display devices was evaluated.The results are shown in Table 9.

TABLE 8 Comparative liquid crystal composition 3 3-Cy-Ph15-O4 115-Cy-Ph15-O4 11 2-Cy-Cy-Ph15-1 12 2-Cy-Cy-Ph15-O2 9 3-Cy-Cb1-Ph15-O2 43-Cy-Cy-Ph15-1 12 3-Cy-Cy-Ph15-O2 9 5-Cy-Cb1-Ph15-O2 6 5-Cy-Cb-Ph15-O218 5-Cy-Cy-Ph15-O2 8 Composition ratio total (%) 100 Tni/° C. 118.1Δn(20° C.) 0.105 ne(20° C.) 1.586 Δε(20° C.) −6.4 ε⊥(20° C.) 10.4K3/K1(20° C.) 1.05 K1/pN(20° C.) 20.2

TABLE 9 Comparative Comparative Comparative Comparative Example 10Example 11 Example 12 Example 13 Liquid crystal Comparative ComparativeComparative Comparative composition liquid liquid liquid liquid crystalcrystal crystal crystal com- com- com- com- position 3 position 3position 3 position 3 Color filter Color filter 1 Color filter 2 Colorfilter 3 Color filter 4 VHR 98.5 98.2 98.6 98.6 ID 107 138 107 112 Imagesticking C D C D

The liquid crystal display devices of Comparative Examples 10 to 13showed lower VHR and larger ID than the liquid crystal display devicesof the present invention. Also, in evaluation of image sticking, theoccurrence of residual image at an unallowable level was observed.

Examples 5 to 12

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 10 was held, and liquid crystal displaydevices of Examples 5 to 12 were formed by using the color filters shownin Table 1. VHR and ID of the resultant liquid crystal display deviceswere measured. Also, image sticking of the resultant liquid crystaldisplay devices was evaluated. The results are shown in Tables 11 and12.

TABLE 10 Liquid crystal Liquid crystal composition 2 composition 33-Cy-1O-Ph5-O2 11 11 5-Cy-1O-Ph5-O2 10 10 0d1-Cy-Cy-3 20 0d1-Cy-Cy-5 200d3-Cy-Cy-3 10 10 3-Cy-1=1-Cy-3 10 10 0d1-Cy-1O-Ph5-O1-Cy-3 50d1-Cy-Cy-1O-Ph5-O3d0 5 0d1-Cy-Cy-1O-Ph5-O4d0 5 2-Cy-Cy-1O-Ph5-O2 5 53-Cy-Cy-1O-Ph5-O2 12 12 4-Cy-Cy-1O-Ph5-O2 5 5 0d1-Cy-1O-Ph5-O1-Cy-Cy-1d012 0d1-Cy-1O-Ph5-O1-Cy-Cy-2 5 0d1-Cy-1O-Ph5-O1-Cy-Cy-3 2 Compositionratio total (%) 100 100 Tni/° C. 79.6 78.9 Δn (20° C.) 0.074 0.075η20/mPa · s 17.8 18.2 Δε (20° C.) −4.8 −4.8

TABLE 11 Example 5 Example 6 Example 7 Example 8 Liquid Liquid LiquidLiquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 2 2 2 2 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.0 99.7 99.3 ID 68 73 14 28 Image sticking A B A A

TABLE 12 Example 9 Example 10 Example 11 Example 12 Liquid Liquid LiquidLiquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 3 3 3 3 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.099.1 99.6 99.4 ID 79 78 19 25 Image sticking B B A A

The liquid crystal display devices of Examples 5 to 12 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 13 to 28

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 13 was held, and liquid crystal displaydevices of Examples 13 to 28 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant liquidcrystal display devices was evaluated. The results are shown in Tables14 to 17.

TABLE 13 Liquid crystal Liquid crystal Liquid crystal Liquid crystalcomposition 4 composition 5 composition 6 composition 70d1-Cy-1O-Ph5-O3d0 5 0d1-Cy-1O-Ph5-O4d0 5 0d1-Cy-Cy-3 10 4 3-Cy-Cy-2 1018 10 3-Cy-Cy-4 6 15 3 3-Cy-Ph-O2 12 12 15 4 5-Ph-Ph-1 10 3 3 100d1-Cy-1O-Ph5-O1-Cy-2 10 10 10 0d1-Cy-1O-Ph5-O1-Cy-3 12 12 120d1-Cy-1O-Ph5-O1-Cy-4 12 12 12 0d1-Cy-1O-Ph5-O1-Cy-5 10 10 100d1-Cy-Cy-1O-Ph5-O1d0 10 0d1-Cy-Cy-1O-Ph5-O2d0 10 0d1-Cy-Cy-1O-Ph5-O3d015 0d1-Cy-Cy-1O-Ph5-O4d0 15 3-Cy-Cy-Ph-1 6 3 6 0d1-Cy-1O-Ph5-O1-Cy-Cy-24 4 4 0d1-Cy-1O-Ph5-O1-Cy-Cy-3 4 4 4 Composition ratio total (%) 100 100100 100 Tni/° C. 75.5 81.8 83.5 75.1 Δn (20° C.) 0.088 0.077 0.078 0.087η20/mPa · s 16 16.5 20.2 15.5 Δε (20° C.) −4.2 −4.2 −4.2 −4.3

TABLE 14 Example 13 Example 14 Example 15 Example 16 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 4 4 4 4 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.099.2 99.4 99.5 ID 64 57 26 18 Image sticking A A A A

TABLE 15 Example 17 Example 18 Example 19 Example 20 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 5 5 5 5 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.199.0 99.6 99.4 ID 59 71 16 21 Image sticking A B A A

TABLE 16 Example 21 Example 22 Example 23 Example 24 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 6 6 6 6 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.1 99.6 99.3 ID 64 80 17 26 Image sticking A B A A

TABLE 17 Example 25 Example 26 Example 27 Example 28 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 7 7 7 7 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.399.0 99.5 99.2 ID 53 88 23 42 Image sticking A B A A

The liquid crystal display devices of Examples 13 to 28 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 29 to 40

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 18 was held, and liquid crystal displaydevices of Examples 29 to 40 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant liquidcrystal display devices was evaluated. The results are shown in Tables19 to 21.

TABLE 18 Liquid Liquid Liquid crystal crystal crystal compositioncomposition composition 8 9 10 2-Cy-2-Nd4-O2 4 4 2-Cy-2-Nd4-O4 4 43-Cy-1O-Ch3-5 3 3-Cy-1O-Nd4-O4 3 4 4 5-Cy-1O-Ch3-5 3 5-Cy-1O-Nd4-O2 25-Cy-1O-Nd4-O3 3 4 4 0d1-Cy-Cy-5 23 0d3-Cy-Cy-3 10 1d1-Cy-Cy-3 83-Cy-Cy-2 15 3-Cy-Cy-4 7 6 22 3-Cy-Cy-5 7 22 3-Cy-Ph-2 15 15 3-Cy-Ph-O15 3-Cy-Ph-O2 5 5-Ph-Ph-1 6 2-Cy-Cy-1O-Nd4-O2 3 4 4 2-Cy-Cy-1O-Nd4-O4 2 44 3-Cy-2-Cy-1O-Nd4-O2 4 3-Cy-2-Cy-1O-Nd4-O3 4 3-Cy-Cy-1O-Ch3-5 33-Cy-Cy-1O-Nd4-O4 3 4 4 4-Cy-Cy-1O-Ch3-5 3 4-Cy-Cy-1O-Nd4-O2 2 4 44-Cy-Cy-2-Nd4-O2 6 6 3-Cy-Cy-Ph-1 8 3 Composition ratio total (%) 100100 100 Tni/° C. 92 90 91 Δn (20° C.) 0.093 0.092 0.093 η20/mPa · s 24.924.1 25.5 Δε (20° C.) −3.3 −3.2 −3.2

TABLE 19 Example 29 Example 30 Example 31 Example 32 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 8 8 8 8 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR  98.999.2 99.7 99.5 ID 108 95 13 17 Image sticking B B A A

TABLE 20 Example 33 Example 34 Example 35 Example 36 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 9 9 9 9 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.2 99.6 99.3 ID 98 96 19 35 Image sticking B B A A

TABLE 21 Example 37 Example 38 Example 39 Example 40 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 10 10 10 10 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR  99.1 99.1 99.5 99.2 ID 103 107 21 45 Image sticking B B A A

The liquid crystal display devices of Examples 29 to 40 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 41 to 48

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 22 was held, and liquid crystal displaydevices of Examples 41 to 48 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant liquidcrystal display devices was evaluated. The results are shown in Tables23 and 24.

TABLE 22 Liquid crystal Liquid crystal composition 11 composition 123-Cy-1O-Ch3-5 2 3-Cy-2-Ph5-O2 6 10 3-Cy-Ph5-O2 10 4-Cy-1O-Nd4-O2 5 55-Cy-1O-Ch3-5 2 0d1-Cy-Cy-5 16 3-Cy-1=1-Cy-3 10 3-Cy-Cy-2 15 3-Cy-Cy-4 73-Cy-Cy-5 7 3-Cy-Ph-O1 6 3-Cy-2-Cy-1O-Nd4-O2 3 3-Cy-2-Cy-1O-Nd4-O3 33-Cy-Cy-1O-Ch3-5 2 3-Cy-Cy-2-Ph5-O2 7 10 3-Cy-Cy-Ph5-1 7 103-Cy-Cy-Ph5-O2 7 10 4-Cy-Cy-1O-Ch3-5 2 5-Cy-Cy-1O-Nd4-O3 5 50d1-Cy-Cy-Ph-1 14 3-Cy-Cy-Ph-1 14 Composition ratio total (%) 100 100Tni/° C. 87 85 Δn (20° C.) 0.086 0.085 η20/mPa · s 24.2 23.8 Δε (20° C.)−2.7 −2.5

TABLE 23 Example 41 Example 42 Example 43 Example 44 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 11 11 11 11 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.499.2 99.7 99.6 ID 82 94 12 16 Image sticking A B A A

TABLE 24 Example 45 Example 46 Example 47 Example 48 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 12 12 12 12 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR  99.399.4 99.8 99.6 ID 102 76 10 19 Image sticking B A A A

The liquid crystal display devices of Examples 41 to 48 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 49 to 60

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 25 was held, and liquid crystal displaydevices of Examples 49 to 60 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant, liquidcrystal display devices was evaluated. The results are shown in Tables26 to 28.

TABLE 25 Liquid Liquid crystal crystal composition Liquid crystalcomposition 13 composition 14 15 3-Cy-1O-Ch3-5 3 3-Cy-1O-Nd4-O4 3 45-Cy-1O-Ch3-5 3 5-Cy-1O-Nd4-O2 2 4 4 5-Cy-1O-Nd4-O3 3 4 4 3-Cy-Cy-2 7 2111 3-Cy-Cy-4 11 7 7 3-Cy-Cy-5 11 7 7 3-Cy-Ph-2 7 3-Cy-Ph-O1 7 13 73-Cy-Ph-O2 7 13 7 5-Ph-Ph-1 6 13 2-Cy-Cy-1O-Nd4-O2 3 4 42-Cy-Cy-1O-Nd4-O4 2 3-Cy-2-Cy-1O-Nd4-O2 3 4 4 3-Cy-2-Cy-1O-Nd4-O3 3 4 43-Cy-Cy-1O-Ch3-5 2 3 3-Cy-Cy-1O-Nd4-O4 3 4 4 4-Cy-Cy-1O-Ch3-5 2 34-Cy-Cy-1O-Nd4-O2 2 3-Cy-Cy-Ph-1 8 9 7 3-Cy-Ph-Ph-1 9 6 Compositionratio total (%) 100 100 100 Tni/° C. 86 81 76 Δn (20° C.) 0.091 0.0820.104 η20/mPa · s 20 19.2 17.8 Δε (20° C.) −2.7 −2.5 −2.3

TABLE 26 Example 49 Example 50 Example 51 Example 52 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 13 13 13 13 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.1 99.6 99.4 ID 94 98 21 47 Image sticking A B A A

TABLE 27 Example 53 Example 54 Example 55 Example 56 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 14 14 14 14 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR  99.1 98.9 99.6 99.3 ID 102 107 24 38 Image sticking B B A A

TABLE 28 Example 57 Example 58 Example 59 Example 60 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 15 15 15 15 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.0 99.5 99.4 ID 89 99 32 34 Image sticking A B A A

The liquid crystal display devices of Examples 49 to 60 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 61 to 76

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 29 was held, and liquid crystal displaydevices of Examples 61 to 76 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant liquidcrystal display devices was evaluated. The results are shown in Tables30 to 33.

TABLE 29 Liquid crystal Liquid crystal Liquid crystal Liquid crystalcomposition 16 composition 17 composition 18 composition 193-Cy-1O-Ph5-O2 2 11 5-Cy-1O-Ph5-O2 2 10 0d1-Cy-Cy-3 30 0d1-Cy-Cy-5 4 410 20 0d3-Cy-Cy-3 10 3-Cy-1=1-Cy-3 10 3-Cy-Cy-2 4 4 3-Cy-Cy-4 4 43-Cy-Cy-5 4 4 3-Cy-Ph-O1 2 2 5-Ph-Ph-1 20 20 0d1-Cy-1O-Ph5-O1-Cy-1d0 120d1-Cy-1O-Ph5-O1-Cy-2 7 8 10 0d1-Cy-1O-Ph5-O1-Cy-3 7 8 120d1-Cy-1O-Ph5-O1-Cy-4 7 8 12 0d1-Cy-1O-Ph5-O1-Cy-5 5 100d1-Cy-Cy-1O-Ph5-O3d0 13 6 0d1-Cy-Cy-1O-Ph5-O4d0 13 6 2-Cy-Cy-1O-Ph5-O213 5 3-Cy-Cy-1O-Ph5-O2 13 12 4-Cy-Cy-1O-Ph5-O2 13 50d1-Cy-1O-Ph5-O1-Cy-Cy-2 5 2 5 0d1-Cy-1O-Ph5-O1-Cy-Cy-3 5 5 2Composition ratio total (%) 100 110 100 100 Tni/° C. 80.5 79.8 83.6 83.1Δn (20° C.) 0.102 0.101 0.075 0.075 η20/mPa · s 23.9 27.6 15.1 18 Δε(20° C.) −4.1 −4.1 −4.8 −4.8

TABLE 30 Example 61 Example 62 Example 63 Example 64 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 16 16 16 16 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.199.0 99.4 99.2 ID 86 98 31 57 Image sticking A B A A

TABLE 31 Example 65 Example 66 Example 67 Example 68 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 17 17 17 17 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.0 99.4 99.3 ID 87 96 34 41 Image sticking A B A A

TABLE 32 Example 69 Example 70 Example 71 Example 72 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 18 18 18 18 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.199.2 99.5 99.3 ID 94 89 28 37 Image sticking B A A A

TABLE 33 Example 73 Example 74 Example 75 Example 76 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 19 19 19 19 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR  99.099.0 99.6 99.4 ID 102 97 19 34 Image sticking B B A A

The liquid crystal display devices of Examples 61 to 76 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 77 to 92

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 34 was held, and liquid crystal displaydevices of Examples 77 to 92 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant liquidcrystal display devices was evaluated. The results are shown in Tables35 to 38.

TABLE 34 Liquid crystal Liquid crystal Liquid crystal Liquid crystalcomposition 20 composition 21 composition 22 composition 232-Cy-2-Nd4-O2 10 10 3-Cy-1O-Ch3-O5 7 10 3-Cy-2-Nd4-O4 10 104-Cy-2-Nd4-O2 10 10 5-Cy-1O-Ch3-O5 7 10 5-Cy-2-Nd4-O2 5 5 0d1-Cy-Cy-3 3040 0d1-Cy-Cy-5 15 20 3-Cy-Cy-4 15 14 3-Cy-Ph-O2 10 5-Ph-Ph-1 10 102-Cy-Cy-2-Nd4-O2 4 4 3-Cy-Cy-1O-Ph5-O1 4 3 3-Cy-Cy-1O-Ph5-O2 9 53-Cy-Cy-2-Ph5-O2 10 10 3-Cy-Cy-Ph5-O2 10 10 4-Cy-Cy-1O-Ph5-O1 4 34-Cy-Cy-2-Nd4-O2 4 4 0d1-Cy-Cy-Ph-1 9 6 9 4 0d1-Cy-Ph-Ph-3 5 30d3-Cy-Cy-Ph-1 6 6

 (%) 100 100 100 100 Composition ratio total (%) 82.7 82.3 80.9 81.8 Δn(20° C.) 0.087 0.098 0.084 0.097 η20/mPa · s 19.4 18.1 26 22.7 Δε (20°C.) −3.1 −3.1 −3.1 −3.2

TABLE 35 Example 77 Example 78 Example 79 Example 80 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 20 20 20 20 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.1 99.7 99.5 ID 71 76 14 22 Image sticking A B A A

TABLE 36 Example 81 Example 82 Example 83 Example 84 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 21 21 21 21 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.1 98.9 99.4 99.3 ID 97 104 36 75 Image sticking B B A A

TABLE 37 Example 85 Example 86 Example 87 Example 88 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 22 22 22 22 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.399.2 99.6 99.4 ID 68 74 27 34 Image sticking A B A A

TABLE 38 Example 89 Example 90 Example 91 Example 92 Liquid crystalLiquid Liquid Liquid Liquid composition crystal crystal crystal crystalcomposition composition composition composition 23 23 23 23 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR  99.1 99.0 99.5 99.1 ID 100 106 35 86 Image sticking B B A A

The liquid crystal display devices of Examples 77 to 92 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 93 to 100

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 39 was held, and liquid crystal displaydevices of Examples 93 to 100 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant liquidcrystal display devices was evaluated. The results are shown in Tables40 and 41.

TABLE 39 Liquid crystal Liquid crystal composition 24 composition 253-Cy-Ph5-O4 9 10 3O-Ph5-Ph5-O2 8 5-Cy-Ph5-O4 9 10 0d1-Cy-Cy-5 50d1-O-Cy-Cy-Ph5-1 10 0d2-Cy-Cy-Ph5-O2 10 0d2-O-Cy-Cy-Ph5-1 101d2-O-Cy-Cy-Ph5-1 8 2-Cy-Cy-Ph5-1 11 12 2-Cy-Cy-Ph5-O2 9 103-Cy-Cy-Ph5-1 10 11 3-Cy-Cy-Ph5-O2 10 10 3-O-Cy-Cy-Ph5-O2 105-Cy-Cy-Ph5-O2 9 9 Composition ratio total (%) 100 100 Tni/° C. 101.2103.9 Δn (20° C.) 0.100 0.098 ne (20° C.) 1.581 1.579 Δε (20° C.) −7.5−5.5 ε⊥ (20° C.) 11.9 9.5 K3/K1 (20° C.) 1.08 1.16 K1/pN (20° C.) 15.816.5

TABLE 40 Example 93 Example 94 Example 95 Example 96 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 24 24 24 24 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.399.3 99.8 99.4 ID 59 61 11 52 Image sticking A A A A

TABLE 41 Example 97 Example 98 Example 99 Example 100 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 25 25 25 25 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.3 99.7 99.3 ID 68 64 18 47 Image sticking A A A A

The liquid crystal display devices of Examples 93 to 100 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 101 to 112

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 42 was held, and liquid crystal displaydevices of Examples 101 to 112 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant, liquidcrystal display devices was evaluated. The results are shown in Tables43 to 45.

TABLE 42 Liquid crystal Liquid crystal Liquid crystal composition 26composition 27 composition 28 3-Cy-Ph5-O4 16 16 16 5-Cy-Ph5-O2 12 16 160d1-Cy-Cy-5 7 4 10 0d3-Ph-Ph-1 11 10 10 1d1-Cy-Cy-3 9 8 2-Cy-Ph-Ph5-O213 12 12 3-Cy-Cy-Ph5-O2 6 7 10 3-Cy-Ph-Ph5-O2 12 12 12 0d1-Cy-Cy-Ph-1 44 4 3-Cy-Ph-Ph-2 10 11 10 Composition ratio total 100 100 100 (%) Tni/°C. 80.2 80.3 80.9 Δn(20° C.) 0.128 0.129 0.126 ne(20° C.) 1.492 1.4911.491 Δε(20° C.) −3.3 −3.5 −3.7 ε⊥(20° C.) 6.8 7.1 7.4 K3/K1(20° C.)0.99 1.01 1.04 K1/pN(20° C.) 16.7 15.2 16.4

TABLE 43 Example 101 Example 102 Example 103 Example 104 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 26 26 26 26 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.399.1 99.6 99.3 ID 57 78 28 49 Image sticking A A A A

TABLE 44 Example 105 Example 106 Example 107 Example 108 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 27 27 27 27 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.299.1 99.6 99.4 ID 69 82 26 41 Image sticking A B A A

TABLE 45 Example 109 Example 110 Example 111 Example 112 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 28 28 28 28 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.399.2 99.5 99.3 ID 54 80 30 53 Image sticking A A A A

The liquid crystal display devices of Examples 101 to 112 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 113 to 124

As in Example 1, each of liquid crystals with negative dielectricanisotropy shown in Table 46 was held, and liquid crystal displaydevices of Examples 101 to 112 were formed by using the color filtersshown in Table 1. VHR and ID of the resultant liquid crystal displaydevices were measured. Also, image sticking of the resultant liquidcrystal display devices was evaluated. The results are shown in Tables47 to 49.

TABLE 46 Liquid crystal Liquid crystal Liquid crystal composition 29composition 30 composition 31 3-Cy-Ph5-O4 16 16 16 5-Cy-Ph5-O2 12 16 160d1-Cy-Cy-5 12 10 20 0d3-Ph-Ph-1 6 4 1d1-Cy-Cy-3 9 8 2-Ph-Ph5-Ph-2 13 1212 3-Cy-Cy-Ph5-O2 6 7 10 3-Cy-Ph-Ph5-O2 12 12 12 0d1-Cy-Cy-Ph-1 4 4 43-Cy-Ph-Ph-2 10 11 10 Composition ratio total 100 100 100 (%) Tni/° C.81.7 81.2 80.9 Δn(20° C.) 0.127 0.130 0.131 ne(20° C.) 1.494 1.495 1.498Δε(20° C.) −3.0 −3.3 −3.6 ε⊥(20° C.) 6.9 7.2 7.5 K3/K1(20° C.) 1.02 1.031.06 K1/pN(20° C.) 15.8 15.6 16.2

TABLE 47 Example 113 Example 114 Example 115 Example 116 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 29 29 29 29 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.399.2 99.7 99.5 ID 55 81 18 44 Image sticking A B A A

TABLE 48 Example 117 Example 118 Example 119 Example 120 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 30 30 30 30 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.499.0 99.5 99.6 ID 42 84 32 27 Image sticking A B A A

TABLE 49 121 122 123 124 Liquid Liquid Liquid Liquid Liquid crystalcrystal crystal crystal crystal composition composition compositioncomposition composition 31 31 31 31 Color filter Color filter 1 Colorfilter 2 Color filter 3 Color filter 4 VHR 99.3 99.1 99.7 99.2 ID 54 8622 61 Image sticking A B A A

The liquid crystal display devices of Examples 113 to 124 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 125 to 128

As in Example 1, a liquid crystal with negative dielectric anisotropyshown in Table 50 was held, and liquid crystal display devices ofExamples 125 to 128 were formed by using the color filters shown inTable 1. VHR and ID of the resultant liquid crystal display devices weremeasured. Also, image sticking of the resultant liquid crystal displaydevices was evaluated. The results are shown in Table 51.

TABLE 50 Liquid crystal composition 32 0d1-Cy-Cy-5 20 3-Cy-2-Ph5-O2 200d1-Cy-Cy-Ph-1 5 5-Cy-2-Ph5-O2 20 3-Cy-Cy-2-Ph5-O2 3 5-Cy-Cy-Ph5-O2 33-Cy-Ph-Ph5-O2 5 3-Ph-Ph-Ph-2 7 4-Ph-Ph-Ph-2 7 3-Cy-Cy-VO-Ph-Cy-3 43-Cy-Cy-VO-Ph-Cy-4 3 3-Cy-Cy-VO-Ph-Cy-5 3 Composition ratio total (%)100 Tni/° C. 81.6 Δn (20° C.) 0.127 ne (20° C.) 1.495 Δε (20° C.) −3.0

TABLE 51 Example 125 Example 126 Example 127 Example 128 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 32 32 32 32 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.499.1 99.5 99.3 ID 59 78 23 45 Image sticking A B A A

The liquid crystal display devices of Examples 125 to 128 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 129 to 132

A liquid crystal composition 33 was prepared by mixing 0.3% by mass of2-methyl-acrylic acid4′-{2-[4-(2-acryloyloxy-ethyl)-phenoxycarbonyl]-ethyl}-biphenyl-4-ylester with the liquid crystal composition 1 having negative dielectricanisotropy and used in Example 1. The liquid crystal composition 33 wasinterposed in a VA cell used in Example 1 and then polymerized byultraviolet irradiation (3.0 J/cm²) for 600 seconds while a drivingvoltage was applied between electrodes. Next, liquid crystal displaydevices of Examples 129 to 132 were formed by using the color filters 1to 4 shown in Table 1, and VHR and ID of the resultant liquid crystaldisplay devices were measured. Also, image sticking of the resultantliquid crystal display devices was evaluated. The results are shown inTable 52.

TABLE 52 Example 129 Example 130 Example 131 Example 132 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 33 33 33 33 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.098.8 99.3 99.2 ID 78 93 24 43 Image sticking A B A A

The liquid crystal display devices of Examples 129 to 132 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

The same measurement was performed using biphenyl-4,4′-diylbismethacrylate in place of 2-methyl-acrylic acid4′-{2-[4-(2-acryloyloxy-ethyl)-phenoxycarbonyl]-ethyl}-biphenyl-4-ylester. As a result, like in Examples 129 to 132, high VHR and small IDcould be realised, and in evaluation of image sticking, no residualimage or slight residual image at an allowable level was observed.

Examples 133 to 136

A liquid crystal composition 34 was prepared by mixing 0.3% by mass ofbiphenyl-4,4′-diyl bismethacrylate with the liquid crystal composition29 having negative dielectric anisotropy. The liquid crystal composition34 was interposed in a VA cell used in Example 1 and then polymerized byultraviolet irradiation (3.0 J/cm²) for 600 seconds while a drivingvoltage was applied between electrodes. Next, liquid crystal displaydevices of Examples 133 to 136 were formed by using the color filters 1to 4 shown in Table 1, and VHR and ID of the resultant liquid crystaldisplay devices were measured. Also, image sticking of the resultantliquid crystal display devices was evaluated. The results are shown inTable 53.

TABLE 53 Example 133 Example 134 Example 135 Example 136 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 34 34 34 34 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.399.1 99.5 99.4 ID 76 90 22 40 Image sticking A B A A

The liquid crystal display devices of Examples 133 to 136 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

Examples 137 to 140

A liquid crystal composition 35 was prepared by mixing 0.3% by mass of3-fluorobiphenyl-4,4′-diyl bismethacrylate with the liquid crystalcomposition 32 having negative dielectric anisotropy. The liquid crystalcomposition 35 was interposed in a VA cell used in Example 1 and thenpolymerized by ultraviolet irradiation (3.0 J/cm²) for 600 seconds whilea driving voltage was applied between electrodes. Next, liquid crystaldisplay devices of Examples 137 to 140 were formed by using the colorfilters 1 to 4 shown in Table 1, and VHR and ID of the resultant liquidcrystal display devices were measured. Also, image sticking of theresultant liquid crystal display devices was evaluated. The results areshown in Table 54.

TABLE 54 Example 137 Example 138 Example 139 Example 140 Liquid LiquidLiquid Liquid Liquid crystal crystal crystal crystal crystal compositioncomposition composition composition composition 35 35 35 35 Color filterColor filter 1 Color filter 2 Color filter 3 Color filter 4 VHR 99.298.9 99.5 99.6 ID 77 92 23 44 Image sticking A B A A

The liquid crystal display devices of Examples 137 to 140 could realizehigh VHR and small ID. Also, in evaluation of image sticking, noresidual image or slight residual image at an allowable level wasobserved.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a drawing showing an example of a general liquid crystaldisplay device.

FIG. 2 is a drawing showing an example of a liquid crystal displaydevice according to the present invention.

REFERENCE SIGNS LIST

-   -   1 substrate    -   2 color filter layer    -   2 a color filter layer containing specified dye and/or pigment    -   3 a transparent electrode layer (common electrode)    -   3 b pixel electrode layer    -   4 alignment film    -   5 liquid crystal layer    -   5 a liquid crystal layer containing specified liquid crystal        composition

The invention claimed is:
 1. A liquid crystal display device comprisinga first substrate, a second substrate, a liquid crystal compositionlayer held between the first substrate and the second substrate, a colorfilter including a black matrix and at least RGB three-color pixelportions, a pixel electrode, and a common electrode, wherein the liquidcrystal composition layer includes a liquid crystal composition whichcontains at least one compound selected from a compound grouprepresented by general formula (LC1) to general formula (LC4),

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 15 carbon atoms, at least one CH₂ group in the alkyl groupmay be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF₂O—,or —OCF₂— so that oxygen atoms are not directly adjacent to each other,at least one hydrogen atom in the alkyl group may be arbitrarilysubstituted by a halogen, A₁ and A₂ each independently represent any oneof the following structures,

(at least one CH₂ group in a cyclohexane ring in the structures may besubstituted by an oxygen atom, at least one CH group in a benzene ringin the structures may be substituted by a nitrogen atom, and at leastone hydrogen atom in the structures may be substituted by Cl, CF₃, orOCF₃), Z₁ to Z₄ each independently represent a single bond, —CH═CH—,—C≡C—, —CH₂CH₂—, —(CH₂)₄—, —COO—, —OCH₂—, —CH₂O—, —OCF₂—, or —CF₂O—, Z₅represents a CH₂ group or an oxygen atom, at least one of Z₁ and Z₂present is not a single bond, l₁ represents 0 or 1, m₁ and m₂ eachindependently represent 0 to 3, and m₁+m₂ is 1, 2, or 3), and the RGBthree-color pixel portions include, as colorants, a diketopyrrolopyrrolepigment and/or anionic red organic dye in a R pixel portion, at leastone selected from the group consisting of a halogenated copperphthalocyanine pigment, a phthalocyanine green dye, and a mixture of aphthalocyanine blue dye and an azo yellow organic dye in a G pixelportion, and a e-type copper phthalocyanine pigment and/or cationic blueorganic dye in a B pixel portion.
 2. The liquid crystal display deviceaccording to claim 1, wherein the RGB three-color pixel portionsinclude, as colorants, C. I. Solvent Red 124 in the R pixel portion, amixture of C. I. Solvent Blue 67 and C. I. Solvent Yellow 162 in the Gpixel portion, and C. I. Solvent Blue 7 in the B pixel portion.
 3. Theliquid crystal display device according to claim 1, wherein the RGBthree-color pixel portions include, as colorants, C. I. Pigment Red 254in the R pixel portion, C. I. Pigment Green 7 and/or 36 in the G pixelportion, and C. I. Pigment Blue 15:6 in the B pixel portion.
 4. Theliquid crystal display device according to claim 1, wherein the R pixelportion further contains at least one organic dye/pigment selected fromthe group consisting of C. I. Pigment Red 177, 242, 166, 167, and 179,C. I. Pigment Orange 38 and 71, C. I. Pigment Yellow 150, 215, 185, 138,and 139, C. I. Solvent Red 89, C. I. Solvent Orange 56, and C. I.Solvent Yellow 21, 82, 83:1, 33, and
 162. 5. The liquid crystal displaydevice according to claim 1, wherein the G pixel portion furthercontains at least one organic dye/pigment selected from the groupconsisting of C. I. Pigment Yellow 150, 215, 185, and 138, and C. I.Solvent Yellow 21, 82, 83:1, and
 33. 6. The liquid crystal displaydevice according to claim 1, wherein the B pixel portion furthercontains at least one organic dye/pigment selected from the groupconsisting of C. I. Pigment Blue 1, C. I. Pigment Violet 23, C. I. BasicBlue 7, C. I. Basic Violet 10, C. I. Acid Blue 1, 90, and 83, and C. I.Direct Blue
 86. 7. The liquid crystal display device according to claim1, wherein the color filter further includes a Y pixel portion, andcontains, as a colorant in the Y pixel portion, at least one yelloworganic dye/pigment selected from the group consisting of C. I. PigmentYellow 150, 215, 185, 138, and 139, and C. I. Solvent Yellow 21, 82,83:1, 33, and
 162. 8. The liquid crystal display device according toclaim 1, wherein the liquid crystal composition layer includes a liquidcrystal composition further containing at least one compound representedby general formula (LC5),

(in the formula, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 15 carbon atoms, at least one CH₂ group in the alkyl groupmay be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF₂O—,or —OCF₂— so that oxygen atoms are not directly adjacent to each other,at least one hydrogen atom in the alkyl group may be arbitrarilysubstituted by a halogen, B₁ to B₃ each independently represent any oneof the following,

(in the formulae, at least one CH₂CH₂ group in a cyclohexane ring may besubstituted by —CH═CH—, —CF₂O—, or —OCF₂—, and at least one CH group ina benzene ring may be substituted by a nitrogen atom), Z₃ and Z₄ eachindependently represent a single bond, —CH═CH—, —C≡C—, —CH₂CH₂—,—(CH₂)₄—, —COO—, —OCH₂—, —CH₂O—, —OCF₂—, or —CF₂O—, at least one of Z₃and Z₄ is not a single bond, and m₁ represents 0 to 3).
 9. The liquidcrystal display device according to claim 1, wherein the general formula(LC1) represents at least one compound selected from the groupconsisting of compounds represented by general formula (LC1)-1 togeneral formula (LC1)-7,

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms,an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy grouphaving 2 to 7 carbon atoms).
 10. The liquid crystal display deviceaccording to claim 1, wherein the general formula (LC2) represents atleast one compound selected from the group consisting of compoundsrepresented by general formula (LC2)-1 to general formula (LC2)-15,

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms,an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy grouphaving 2 to 7 carbon atoms, Z₁ represents —CH₂CH₂—, —OCH₂—, —CH₂O—,—OCF₂—, or —CF₂O—, and A¹ represents any one of the followingstructures)


11. The liquid crystal display device according to any one of claims 1to 10, wherein the general formula (LC3) represents at least onecompound selected from the group consisting of compounds represented bygeneral formula (LC3)-1 to general formula (LC3)-6 below, and thegeneral formula (LC4) represents at least one compound selected from thegroup consisting of compounds represented by general formula (LC4)-1 togeneral formula (LC4)-4,

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms,an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy grouphaving 2 to 7 carbon atoms).
 12. The liquid crystal display deviceaccording to claim 1, wherein the general formula (LC5) represents atleast one compound selected from the group consisting of compoundsrepresented by general formula (LC5)-1 to general formula (LC5)-13,

(in the formulae, R₁ and R₂ each independently represent an alkyl grouphaving 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms,an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy grouphaving 2 to 7 carbon atoms).
 13. The liquid crystal display deviceaccording to claim 1, wherein the liquid crystal composition layer isobtained by polymerizing the liquid crystal composition furthercontaining at least one polymerizable compound.
 14. The liquid crystaldisplay device according to claim 13, wherein the polymerizable compoundis a disk-shaped liquid crystal compound having a structure in which abenzene derivative, a triphenylene derivative, a truxene derivative, aphthalocyanine derivative, or a cyclohexane derivative serves as acentral mother nucleus of a molecule and is radially substituted bylinear alkyl groups, linear alkoxy groups, or substituted benzoyloxygroups as side chains.
 15. The liquid crystal display device accordingto claim 13, wherein the polymerizable compound is a polymerizablecompound represented by general formula (PC1),

(in the formula, P₁ represents a polymerizable functional group, Sp₁represents a spacer group having 0 to 20 carbon atoms, Q₁ represents asingle bond, —O—, —NH—, —NHCOO—, —OCONH—, —CH═CH—, —CO—, —COO—, —OCO—,—OCOO—, —OOCO—, —CH═CH—, —CH═CH—COO—, —OCO—CH═CH—, or —C≡C—, n₁ and n₂each represent 1, 2, or 3, MG represents a mesogenic group or amesogenity supporting group, R₃ represents a halogen atom, a cyanogroup, or an alkyl group having 1 to 25 carbon atoms, at least one CH₂group in the alkyl group may be substituted by —O—, —S—, —NH—, —N(CH₃)—,—CO—, —COO—, —OCO—, —OCOO—, —SCO—, —COS—, or —C≡C— so that oxygen atomsare not directly adjacent to each other, and alternatively R₃ representsP₂-Sp₂-Q₂- (wherein P₂, Sp₂, and Q₂ represent the same meanings as P₁,Sp₁, and Q₁, respectively).